Yusei whose mother is Kyoko Hirano, a big actress who has been recognized for her popularity and ability. My mother was an ideal woman for Kyoko, who lost her father early, and Yusei, who lives with her. That feeling is Yusei who began to masturbate by watching Kyoko appearing on TV. Mayumi, Kyoko's older sister and aunt, sees such Yusei ... And, in order to satisfy Yusei's distorted desire, Mayumi disguises himself as Kyoko and becomes Yusei's "mama" and begins to perform sexual processing, but Yusei's head has only mother Kyoko. ….